Attachment for drilling machines or drills



July 7, 1931. c. WEBER 1,313,785

ATTACHMENT FOR DRILLING MACHINES OR DRILLS Filed June 30, 1928 2 Sheets-Sheet l fifif 1 I fii'w. z. g 16 E I If j 1a 15 R 10 43 LJ ez o i lILl WITNESSES T R CPYAA'LES M65551? 0 H M d ATTORNEY July 7,1931.

c. WEBER ATTACHMENT FOR DRILLING MACHINES OR DRILLS Filed June 50. 1928 2 sheets-shear INVENTOR CmRLEs n EBER ATTORN EY WITNESSES 24']? M4 Patented July 7, 1931 are CHARLES WEBER, OF PEARSON, WASHINGTON ATTACHMENT FOR DRILLING IVIAGHINES OR DRILLS Application filed June 30,

My invention relates to an attachment to be applied to pneumatic drilling machines, drill presses or the like, and particularly to automatic feed means to advance the drill.

The general object of my invention is to provide an attachment of the indicated character in which the automatic feed is operative by the turning of the drill.

The nature of my invention and its distinguishing features and advantages will more clearly appear as the description proceeds. p

Reference is to be had to the accompanying drawings forming part of this specification, it being understood that the drawings are merely illustrative of examples of the invention. I

igure 1 is a side elevation of an automatic drill feed attachment embodying my invention showin the attachment applied to a pneumatic drill conventionally shown;

Figure 2 is a partly sectional side elevation of a portion of my attachment, parts being in vertical section;

Figure 3 is a horizontal line 3-3 of Figure 1;

Figure ais a. detail in side elevation of the antomatic feed means of the attachment, the view being taken at the opposite side from that shown in Figure 1;

Figure 5 is a side elevation of the attachment applied to a pneumatic drill, showing the attachment in modified form in which the automatic feed means is. omitted and provision made for the use of the hand feed of the pneumatic drill;

Figure 6 is a view similar to Figure 5, but showing a further modification for the section on the use of the attachment without the automatic drill feed means and permitting the use of the hand feed of the drilling machine, the drill and chuck being omitted.

Referring more particularly to the form and mode of use of the invention with automatic feed shown in Figure 1, the attachment is made to embody a frame which advanta geously is made of angle members, the main upper section 10 having a detachable top member 11.

On the frame member 10 at the top is a 1928. Serial No. 283.32

rigidlateral arm 12 having asleeve 13, and on the detachable top member 11 is a lateral arm 14 formed with a sleeve 15, said sleeves 13 and 15 being adaptedto he slipped on to the upper end a of the feed screw of a drill such as is embodied in the known'form of drilling machine indicated at A.

In the example shown for detachably sccuring the top member 10 to the frame member 11, said frame member is formed with bolt holes 16, and the top member 11 has registering bolt holes 17 said registering bolt holes receiving fastening bolts 11? in practies. The arm 14 may be separately formed and secured to the top member 11 by rivets 18,

The lower portion of the frame is detachable and may be substituted by a frame member of different form. in Figures 1 and 2 the frame member 10 is formed with bolt holes 19, and a separate lower frame member 22 is formed with bolt holes 20 to receive bolts 21 (Fig. 1). In this way frame member 22 is made detachable from frame member 10, and the lower end of frame member 22 is made tubular (see Figures 1 and 3) and telescopes over the post 24 on a base or table 25 adapted to be imposed upon a piece of work 13, such as a plate to be drilled. The drill of the drilling machine is indicated by the let ter C, and the drill chuck by the letter D.

A lateral arm 26 on the frame member 22 is here shown as secured to said member 22 by rivets 27. Arm 26 has at its outer end a sleeve 28 and through said arm 26 passes vertically a feed screw 29 which is swiveled to said arm 26. The swiveling means in the present example consists of a collar 30 on the plain upper end of the screw 29 and a detachable, collar 31 held by a transverse pin 32 to said screw 29, the detachable collar 31 being disposed beneath the yoke or bridge piece 33 on the arm 26.

The lower threaded end 34. of the feed screw 29 engages the internal threads of a vertical socket 35' into. which the said screw 29 telescopes, said socket 35 rising from the base or table 25. On the feed screw 29 is a knurled flange or fixer. collar 36 for manually turning said feed screw in a manner to raise the arm 26 after a feeding operation.

A ratchet wheel 37 is disposed on the screw 29 and is held between the arms of a forked lever 39 having a contact arm 40 which is pressed against by a plate spring 41 holding it in contact with an eccentric 42 on the drill chuck D, so that by the turning of the chuck the eccentric 42 will be revolved and will actuate the lever 40 to vibrate the same. 011 the lever 39 is a pawl 33 which engages the ratchet wheel 37 for turning the same and thereby turning the screw 29 to cause engagement of the collars 30, 31 with arm 26 to actuate the frame and cause the forward feed of the'drill C.

In practice a bar may be employed to exert pressure on the spindle during the operation of the drilling machine A and the functioning of my described attachment.

An arm 43 is formed on the lever 39 at the opposite side of the screw 29 from the arm 40, said arm 43 having an adjusting screw 44 which bears against the tubular portion 23 of the frame element 22 to vary the degree of pressure of the lever 40 against the eccentric 42 under the tension of the spring 41 to limit the wear on the eccentric 42 at the surface of least eccentricity to the chuck D. This adjusting screw also serves to limit the movement of the ratchet wheel 37 with the screw 29 with each rotation of the eccentric 42.

A ratchet 45 is pivoted as at 49 to the lever 39 and has a hooked end 46 adapted to be engaged in a notch 47 on the pawl 38 to hold the pawl out of engagement with the ratchet 37 when my automatic feeding of the drill is not functioning.

In the form shown in Figure 5 the same element 10 is employed with its described appurtenances at the upper end and, therefore, numbered to correspond with Figures 1 and 2. The bolts 21 in the form shown in Figure 5 secure the lower member 122 to the upper member 10. Said member 122 has an offset depending end 50 rising from the base 125. On the member 122 is a laterally disposed drill-steadying collar 128 corresponding with the collar 28 in function. From the form of the, frame as illustrated in Figure 5 it will be seen that the automatic feed means is omitted and, therefore, the feed wheel E of the drilling machine A may be caused to feed the drill C.

r In the form shown in Figure 6 the upper frame member 10 is the same as previously described and the said frame member and its appurtenances are numbered as in the formerly described figures. The lower member 222 has secured thereto an upper terminal member 51 held by rivets 127 or the like, the same member 51 being provided on the member 122 of Figure 5. V The member 222 of Figure 6 is provided with a clamp 52 presenting jaws, said clamp including a clamp screw 53 for securely holding a piece of work such as b to be drilled. On the lower member 222 in Figure 6 is a lateral arm 126 presenting a sleeve or eye 228 cmbracing the chuck D of the drill C and corresponding with elements 128 and 28.

I would state furthermore that while the illustrated examples constitute practical embodiments of my invention, I do not limit myself strictly to the exact details herein illustrated, since, manifestly, the same can be considerably varied without departure from the spirit of the invention as defined in the appended claims.

I claim:

1. A drilling machine attachment, including a base, an adjustable drill support rising from said base and movable with respect thereto, said support including at its upper extremity a pair of vertically adjustable sleeves adapted to receive the feed screw of a drill therethrough and to receive the feed wheel of the screw therebetween to support the drill, said base including a post adapted to receive the lower end of the support thereover in telescopic relation, and means associated with said base for automatically lowering said support and drill in response to rotation of the drill chuck.

2. A drilling machine attachment, includ ing a base and an adjustable drill support rising from said base and movable with respect thereto, said support including at its upper extremity a pair of vertically adjustable sleeves adapted to receive the feed screw of a drill therebetween to support the drill,.said base including a post adapted to receive the lower end of the support thereover in telescopic relation, means associated with said base for automatically lowering said support and drill in response to rotation of the drill chuck, said means including an internally threaded sleeve carried by the base and an externally threaded screw associated with the support, its upper end being associated with the support to retain the support in raised position, and a cam associated with the drill chuck to rotate said screw for downward movement within said internally threaded sleeve.

CHARLES WEBER. 

